It could be that you are not using 80x80 dimension. I know it can't be any bigger than that, but I'm not sure if it can be smaller.
As for the moving around, I'm not exactly sure. I can use a GIF editor and create a slide show, but I don't know how I would get a smooth moving picture without using a hundred slides.
Perhaps what you need is one hundred 80x80 pictures put together in .GIF format?